Circuit for limiting horizontal image size of display

Details Circuit for limiting horizontal image size of display Circuit for limiting horizontal image size of display

1998-08-14

2000-12-12

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, 315399, G09G 104, H01J 2970

Patent

active

061603643

ABSTRACT:
A circuit fixedly limits the horizontal image size of a screen of a CRT display. The circuit for limiting the horizontal image size of the screen detects a voltage indicative of the horizontal image size of the screen with power provided to a horizontal output unit by a field effect transistor in a horizontal output power supply unit. A current mirror circuit coupled to the field effect transistors outputs current which flows into the drain of a field effect transistor when the field effect transistor is turned on. The outputted current is transformed into voltage and the voltage is fed back to the PWM control circuit to limit the horizontal image size of the screen.

REFERENCES:
patent: 4081721 (1978-03-01), HaFerl
patent: 5420484 (1995-05-01), Morrish
patent: 5466993 (1995-11-01), Leaver
patent: 5831398 (1998-11-01), Kim

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